Bank Loans (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans held for sale		$ 207,715	$ 551,248
Gains (losses) recognized from sale of loans		29,800	41,200	$ 13,100
Proceeds from unpaid principal balance of loans		208,000
Accrued interest receivable		27,400	20,800
Impaired loans more than 90 days past due		17,300	13,800
Troubled debt restructurings		200	200
Specific allowance		$ 6,200	$ 8,200
Collateralized loan portfolio		98.50%	98.80%
ASU 2016-13 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in allowance for credit losses	$ 10,400	$ 10,400
Credit Loss Reserves Net		11,500	$ 28,300
Allowance for credit losses		7,500
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral		4,900,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral			3,800,000
Other Income
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gains (losses) recognized from sale of loans		2,500
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans held for sale		207,700	551,200
Unfunded Commitment [Member] | ASU 2016-13 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserve For Unfunded Commitments For Credit Loss		4,000
Stifel Bancorp [Member] | Executive Officers and Directors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans outstanding amount		27,200	23,600
Stifel Bancorp [Member] | Executive Officers and Directors of Certain Affiliated Entities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans outstanding amount		$ 27,200	$ 23,600